The 4th son of Jacob and Leah. His birth was the moment Leah stopped striving for Jacob's love and praised God. He grew up in a house filled with rivalry and hatred toward Joseph.
It was Judah's idea to sell Joseph: "What will we gain if we kill our brother... Come, let’s sell him to the Ishmaelites" (Gen 37:26). He was pragmatic, not compassionate. He saved Joseph's life, but only for profit.
He was formed by "Walking Away." After the Joseph incident, Judah left his brothers (Gen 38:1) and moved among the Canaanites. He married a Canaanite woman and assimilated into the culture, drifting far from the Covenant.